<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>块级元素</title>
    <style>
        div {
            width: 200px;
            height: 200px;
            background: #df1b1b;
        }
    </style>
</head>

<body>
    <div>中秋快乐</div>国庆
    <p>
    <div>这里有问题</div>
    </p>
</body>

</html>